US 11,901,603 B2Granted

Coupled-line rat-race coupler with smooth in-phase and out-of-phase performances

AssigneeBeijing University of Posts and Telecommunications

InventorsYongle Wu, Yiwen Wei, Weimin Wang, Yuhao Yang, Yifan Zhang

Life of this patent

Estimating the term…

Loading patent…

Abstract

A coupled-line rat-race coupler includes four ports and four coupled-lines each composed of two metal lines. Two of the ports are respectively connected with the front ends of the two lines of the first coupled-line, and the other two ports are respectively connected with the front ends of the two lines of the second coupled-line. The two lines of the third coupled-line are short circuited and respectively connected with the back end of one line of the first coupled-line on one side and with the back end of one line of the second coupled-line on the other side. In the fourth coupled-line, one line is open at one end and short circuited at the other end with the other line, which is connected with one line of the first coupled-line and one line of the second coupled-line. The coupled-line rat-race coupler is characterized with smooth and stable output phase.

Claims10

Dependent claims

A coupled-line rat-race coupler with smooth in-phase and out-of-phase performances, the rat-race coupler comprising:

a first port, a second port, a third port and a fourth port;
and
a first coupled-line, a second coupled-line, a third coupled-line and a fourth coupled-line, each of the coupled-lines composed of a first line and a second line of metal;
wherein the first port is connected with a front end of the first line of the first coupled-line, the second port is connected with a front end of the second line of the second coupled-line, the third port is connected with a front end of the second line of the first coupled-line, and the fourth port is connected with a front end of the first line of the second coupled-line;
a back end of the first line of the first coupled-line is connected with a back end of the first line of the second coupled-line;
a front end of the first line of the third coupled-line is short circuited with a front end of the second line of the third coupled-line, a back end of the first line of the third coupled-line is connected with a back end of the second line of the second coupled-line, and a back end of the second line of the third coupled-line is connected with a back end of the second line of the first coupled-line;
and
a front end of the first line of the fourth coupled-line is short circuited with a front end of the second line of the fourth coupled-line, a back end of the first line of the fourth coupled-line is open circuited, and a back end of the second line of the fourth coupled-line is connected with the back end of the first line of the first coupled-line and the back end of the first line of the second coupled-line.

5 more elements

Dependencies are inferred from the claim text.